German mathematician and physicist who specialized in analytic geometry. He presented the logical justification for the duality principle in geometry, and published a book about geometry entitled Analytisch-geometrische Entwicklungen (1828). He discovered homogeneous coordinates independently of Möbius, Bobillier, and Karl Feuerbach, and derived Plücker's equations. In 1847, he turned his interests to physics. He published papers on magnetism and spectroscopy and wrote Neue Geometrie des Raumes. He worked with Hittorf in investigating vacuum tubes.

Additional biographies: MacTutor (St. Andrews)